#include<fstream>
#include<vector>
#include<algorithm>

using namespace std;

ifstream f("interclasari.in");
ofstream g("interclasari.out");

int sum,tests,n;
vector <int> v;

void Read ( void )
{
    f>>tests;
    for(;tests;--tests)
    {
        f>>n;
        for(int i(1) ; i <= n ; ++i )
        {
            int x;
            f>>x;
            v.push_back(x);
        }
        sum+=n;

    }
    f.close();
}
void Solve ( void )
{
    sort(v.begin(),v.end());

}
void Write ( void )
{
    g<<sum<<"\n";
    for (vector<int>::iterator it=v.begin() ; it!=v.end(); ++it )
       g<<*it<<" ";
       g.close();
}
int main ( void )
{
    Read();
    Solve();
    Write();
    return 0;
}